code: def get_supported_filesystems():
      spec = os.getenv("HADOOP_S3_FILESYSTEMS", "s3n,s3a")
      return spec.split(",") if spec else None
  
file_path: h2o-3/h2o-hadoop-2/tests/python/pyunit_s3_import_export.py
imports: import sys, os
  from tests import pyunit_utils
  from datetime import datetime
  import h2o
  import uuid
  from pandas.util.testing import assert_frame_equal
  import boto3
  import warnings
label_desc: Use image node_id 1 for calling a global function with example usage: get_supported_filesystems() and returns: unknown